The UBS4 reading of Romans 5:1 is:
Δικαιωθέντες οὖν ἐκ πίστεως εἰρήνην ἔχομεν πρὸς τὸν θεὸν διὰ τοῦ κυρίου ἡμῶν Ἰησοῦ Χριστοῦ
(emphasis added)
At issue is a textual variation concerning the mood of the first-person plural verb ἔχω. The UBS4 (and the NA28) has chosen the present indicative (ἔχομεν) and gives it an 'A' (certainty), but the present subjunctive (ἔχωμεν) is also a well-supported reading given the weight of the evidence:
{A} ἔχομεν א1 B2 F G Ψ 0220vid 6 104 256 263 365 424 459 1241 1319 1506 1573 1739 1852 1881 2127 2200 2464 Byzpt [P] Lectpt, AD itar vgmss copsa geo slav Basil Gregory-Nyssamss Didymusdub Epiphanius Cyril4/5 // ἔχωμεν א* A B* C D 33 81 436 1175 1912 1962 Byzpt [K L] Lectpt itb, d, f, g, mon, o vg copbo arm eth Marcionacc. to Tertullian Origenlat Gregory-Nyssa Chrysostom Theodore Cyril1/5 Hesychius Theodoretlem; Ambrosiaster Pelagius Julian-Eclanum Augustine
Metzger even acknowledges that the subjunctive reading has "far better" external evidence:
Although the subjunctive ἔχωμεν (א* A B* C D K L 33 81 itd, g vg syrp, pal copbo arm eth al) has far better external support than the indicative ἔχομεν (אa B3 Ggr P Ψ 0220vid 88 326 330 629 1241 1739 Byz Lect it61vid? syrh copsa al), a majority of the Committee judged that internal evidence must here take precedence. Since in this passage it appears that Paul is not exhorting but stating facts (“peace” is the possession of those who have been justified), only the indicative is consonant with the apostle’s argument. Since the difference in pronunciation between ο and ω in the Hellenistic age was almost non-existent, when Paul dictated ἔχομεν, Tertius, his amanuensis (16:22), may have written down ἔχωμεν. (For another set of variant readings involving the interchange of ο and ω, see 1 Cor 15.49.)
(Metzger, A Textual Commentary on the Greek New Testament, Second Edition, 1994), emphasis added.
I can understand a 'C' certainty, and possibly even a 'B' certainty, but to completely disregard the "far better external support" seems heavily biased to me, possibly to favor a Protestant Christian reading of the text. Even Daniel Wallace observes that "the 'A' rating on behalf of the indicative in the UBS4 appears overly confident" (cf. NET Notes on Romans 5:1 and related article).
It seems to me that neither reading disrupts Paul's argument, as the subjunctive could simply be hortatory. What are the implications of each reading in context? Giving proper weight to both internal and external evidence, which reading should be preferred and why?
Also, I am interested in what other scholars have said (i.e. other than Metzger and Wallace)? Does N.T. Wright address this in either of his new books on Paul or in any articles?